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UM10503
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User manual
Rev. 2.1 — 10 December 2015
1334 of 1441
NXP Semiconductors
UM10503
Chapter 47: LPC43xx/LPC43Sxx 10-bit ADC0/1
the NVIC that corresponds to the ADC to control whether this results in an interrupt. The
result register of the A/D channel which is generating an interrupt must be read in order to
clear the corresponding DONE flag.
47.7.3 DMA control
A DMA transfer request is generated from the ADC interrupt request line. To generate a
DMA transfer the same conditions must be met as the conditions for generating an
interrupt. A pending DMA request is cleared after the DMA has read from the requesting
channel’s A/D data register (DR[7:0]). Reading from the global data register (GDR) does
not clear any pending DMA requests.
For DMA transfers, only burst requests are supported. The burst size can be set to one of
the predefined burst sizes in the DMA channel control register (see
). If the
number of ADC channels is not equal to one of the predefined DMA-supported burst sizes
(applicable DMA burst sizes are 1, 4, 8), set the burst size to one.
The DMA transfer size determines when a DMA interrupt is generated. The transfer size
can be set to the number of ADC channels being converted (see
Non-contiguous channels can be transferred by the DMA using the scatter/gather linked
lists (see